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CHEMGUARD FS-221 is a highly efficient, nonionic fluorosurfactant at 40% actives. This fluorosurfactant is soluble in tap and sea water. It has been used in combination with other fluorosurfactants (i.e. CHEMGUARD S-103A, CHEMGUARD FS-818-6, and CHEMGUARD FS-157) to formulate premium AFFF agents meeting the US Military specification (Mil-F-24385F). It provides excellent performance in FP, AFFF, FFFP, and polar formulations. CHEMGUARD FS-221 is highly compatible with anionic, cationic, amphoteric and nonionic surfactants. It is especially useful in providing improved burnback resistance and deluge resistance from sprinklers. Excellent hot edge sealing is obtained with as little as 0.5% of CHEMGUARD FS-221 in a 3% AFFF or FP concentrate.